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NEW YORK (
TheStreet) -- Stocks can't live on growth alone, they need great execution as well, Jim Cramer reminded his
"Mad Money" viewers Wednesday as he highlighted the earnings from
Tesla Motors(TSLA), which delivered on earnings but stumbled on execution.

Cramer said with a stock that's up 346% for the year, there's no room for error, which is why a shortage of batteries was enough to send shares skidding. There may be more selling tomorrow, Cramer noted, as another Elon Musk stock,
SolarCity(SCTY), reports earnings. Once the battery issues are resolved, however, Cramer said he expects this "cult stock" to return to the hot seat.

Cramer used the Tesla story to warn investors investing in
Twitter's initial public offering Thursday. He said if things are not perfect at Twitter, the moments after it opens may be that stock's high for the year.

Being prudent is restraining, Cramer admitted, but as
NPS Pharmaceuticals(NPSP) and
Pioneer Natural Resources(PXD - Get Report) showed us today, a well-diversified portfolio is especially needed with stocks up over 100% for the year. Both NPS and Pioneer stocks tumbled today on quarters that were better than expected but not better than expected enough for growth-hungry investors.

On the flip side, Cramer called out
Hain Celestial(HAIN) and
Open Table(OPEN), two companies with great growth and execution. Both stocks were handsomely rewarded for their efforts today.

Surfing Twitter

What do the latest trends from media companies including
Yahoo!(YHOO),
AOL(AOL) and
Facebook(FB) tell us? There's a lot less work going on at work, and a lot more surfing the Web.

Cramer said the latest reports from just about every media outlet showed growth this quarter, something that can only occur if consumers are either watching two screens at once during their free time, or are consuming media and shopping more while at work.

He said that it's true that with so many smartphones and tablets being purchased two or more screens at once is certainly possible. But given the "always on" nature of the American workplace, it's clear that while at work we're all reading, shopping and watching YouTube in between getting a few things done for the boss.

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